Toy steam engine



FIG. 1 is a front perspective view of a toy steam engine showing my new design;

FIG. 2 is a left side perspective view thereof;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a right side perspective view thereof.

The undisclosed bottom of the design is plain and unornamented. 

The ornamental design for a toy steam engine, as shown and described. 